Squeezed Vacuum as an Accelerator of Revivals
In the Dicke model (DM) of a system of A two-level atoms coupled in a high-Q cavity to a single-mode radiation field the total number of excitations N (the number of photons n plus the number of excited atoms) is an integral of motion. There are two limits when the model has an approximately equidistant eigenvalues spectrum: N 《 A (“weak-field” limit) and N 》 A (“strong-field” limit). The atomic inversion response to a photon number state is then truly periodic. According to the above distinction the Jaynes-Cummings model (JCM) belongs to the “strong-field” limit. For an initial field state being a superposition of photon number states the atomic inversion response is a sum of the responses to each of these states weighted with a corresponding photon number distribution P n. If the initial field is in a thermal or squeezed vacuum state the summation over the photon number always includes the region of small n’s with the greatest weights.
KeywordsPhoton Number Rabi Frequency Revival Time Squeeze Vacuum State Photon Number Distribution
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